Siemens SIMATIC NET Manuel d'utilisation - Page 9

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Siemens SIMATIC NET Manuel d'utilisation
D-sub male connector
The D-sub male connector is plugged into the D-sub female connector of the DTE and secured
by screws. The 12M bus terminal requires a current of 90 mA with a voltage of 5 V supplied by
the DTE between pins 5 (M5) and 6 (P5) of the D-sub male connector.
Pin no.
Short name
1
PE
2
nc
3
B (RxD/TxD-P)
4
nc
5
M5 (DGND)
6
P5 (VP)
7
nc
8
A (RxD/TxD-N)
9
nc
Casing
PE
D-sub male connector pinout
The impedance of the PROFIBUS interface when receiving must be ≥ 10 kilohms (according to
the EIA standard RS-485). The spur line must not be terminated.
Segment length and transmission speed
Transmission speed
9.6 - 187.6 kbps
500 kbps
1.5 Mbps
3 - 12 Mbps
Permitted segment lengths
Bus cable for PROFIBUS, standard type (see catalog IK PI).
Note
Restriction when using the 12M bus terminal at 500 kbps
This restriction only affects segments longer than 80 m.
If the 12M bus terminal is used at a transmission rate of 500 kbps along with several RS-485 bus
terminals with a spur line length of 3.0 m, a minimum distance of 5 m of PROFIBUS cable must
be maintained between two RS-485 bus terminals.
You can locate 12M bus terminals anywhere in the segment; there is no minimum distance
between them that needs to be kept to. You can also arrange a 12M bus terminal between two
RS-485 bus terminals with 3.0 m spur lines if you make sure that the PROFIBUS cable between
two RS-485 bus terminals has a total length of at least 5 m.
12M bus terminal
Operating Instructions, 06/2022, C79000-G8976-C333-02
Meaning
Protective earth, connected to the cable shield
Signal line B
Chassis connection of the 5 volt supply
+ 5 volt connection, 90 mA required
Signal line A
Protective earth, connected to the cable shield
maximum segment length
800 m
400 m
200 m
100 m
Introduction
1.2 Description of the product
9